indusium

Definition of Indusium in English :

1. indusium

a membrane enclosing and protecting the developing spores especially that covering the sori of a fern

WordNet Lexical Database for English. Princeton University. 2010.

Indusium

noun plural -sia (-zɪə)

1.

a membranous outgrowth on the undersurface of fern leaves that covers and protects the developing sporangia

2.

an enveloping membrane, such as the amnion

nounWord forms: plural inˈdusia (ɪnˈduziə ; indo̅oˈzēə; ɪnˈdjuziə ; indyo̅oˈzēə; ɪnˈduʒiə ; indo̅oˈzhēə; ɪnˈdjuʒiə ; indyo̅oˈzhēə)

1. Anatomy and Zoology

a.

any covering membrane, as the amnion

b.

a case enclosing an insect larva or pupa

2. Botany

a.

a membranous outgrowth of the leaf epidermis in certain ferns, covering the sporangia

b.

the annulus of certain fungi

n. pl. in·du·si·a (-zē-ə, -zhē-ə)

An enclosing membrane, as that covering the sorus of a fern.